The Odyssey expansion includes randomly inserted foil-finished premium cards in a limited, 350 all-new, black-bordered card set featuring 110 rares, 110 uncommons, 110 commons and 20 basic lands. Odyssey introduces mechanics based around the graveyard.Flashback - cards can be played again after they go to the graveyard.Threshold - cards get bigger and better with at least 7 cards in graveyard.